1. Department of Pediatrics, Third Xiangya Hospital of Central South University, Changsha, Hunan, P.R. China
2. Department of Nephropathy and Rheumatology, Third Xiangya Hospital of Central South University, Changsha, Hunan, P.R. China
3. Department of Pediatrics, Zhuzhou Central Hospital, Zhuzhou, Hunan, P.R. China
4. Central Laboratory, The Third Xiangya Hospital of Central South University, Changsha, Hunan, P.R. China